Jackson Browne is one of rock's great songwriters, having penned classic tunes for the likes of Nico (who he also screwed), Linda Ronstadt (ditto), the Byrds and the Eagles.
One of the sickest Browne tunes is "Somebody's Baby" from the Fast Times soundtrack.
Here's a horrible quality video of the song in the main sex scene from the movie.
Browne and his band performing the tune in 1982:
Jackson Browne "Somebody's Baby"
Yo La Tengo "Somebody's Baby"
Nico "These Days" (written by Browne)